Question: A certain lightbulb has a tungsten filament with a resistance of 19.0 ' when cold and 140 ' when hot. Assume that the resistivity of

A certain lightbulb has a tungsten filament with a resistance of 19.0 ' when cold and 140 ' when hot. Assume that the resistivity of tungsten varies linearly with temperature even over the large temperature range involved here, and find the temperature of the hot filament. Assume the initial temperature is 20.0°C.

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